<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>后盾人</title>
  </head>
  <body></body>
  <script>
    let set = new Set(["hdcms", "houdunren"]);
    // console.log(set.clear());
    // console.log(set.delete("hdcms.com"));
    console.log(set.size);
    // console.log(set.delete("hdcms"));
    // console.log(set.size);
    // console.log(set.values());
    //add has
    // console.log(set.size);
    // console.log(set.has("hdcms.com"));
    // let set = new Set([..."hdcms"]);
    // console.log(set);
  </script>
</html>
